MVVM DataGrid的结合(MVVM datagrid binding)

2019-07-03 16:24发布

我使用的MVVM为我的项目,我想表从我有一个DataGrid绑定数据库。 但是,当我跑我的应用程序数据网格是空的。

MainWindow.xaml.cs:

 public MainWindow(){
        InitializeComponent(); 
        DataContext = new LecturerListViewModel()
    }

MainWindow.xaml:

 <DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Source=Lecturers}" >
            <DataGrid.Columns>
                <DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
                <DataGridTextColumn Header="Surname" Binding="{Binding Surname}"/>
                <DataGridTextColumn Header="Phone" Binding="{Binding Phone_Number}" />
            </DataGrid.Columns>
 </DataGrid>

LecturerListViewModel.cs:

public class LecturerListViewModel : ViewModelBase<LecturerListViewModel> 
{

    public ObservableCollection<Lecturer> Lecturers;
    private readonly DataAccess _dataAccess = new DataAccess();

    public LecturerListViewModel()
    {
        Lecturers = GetAllLecturers();
    }

和ViewModelBase实现INotifyPropertyChanged。

Lecturer.cs

public class Lecturer
{
    public Lecturer(){}

    public int Id_Lecturer { get; set; }
    public string Name { get; set; }
    public string Surname { get; set; }
    public string Phone_Number { get; set; }

我做错了什么? 我debuger检查,并DataContext的包含了所有的讲师,但是疗法没有在数据网格中。

Answer 1:

您在结合有一个错误。 试试这个:

<DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Lecturers}" >

代码隐藏:

private ObservableCollection<Lecturer> _lecturers = new ObservableCollection<Lecturer>();
public ObservableCollection<Lecturer> Lecturers
{
   get { return _lecturers; }
   set { _lecturers = value; }
}

这里是简单的示例代码(LecturerSimpleBinding.zip)。



Answer 2:

开始了

 <DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Path=Lecturers}" >

然后

private ObservableCollection<Lecturer> lecturers;

public ObservableCollection<Lecturer> Lecturers
{
    get { return lecturers; }
    set
    {
        lecturers = value;
        this.NotifyPropertyChanged("Lecturers");
    }
}


Answer 3:

上述赛义德·萨阿德是正确的。 我看到您的设置两个潜在的问题,这两个赛义德解决。

  1. 张贴在问题DOEN的例子不执行INotifyPropertyChanged
  2. 在CLR属性被绑定到必须是公共财产。 场将无法正常工作,因为databindindg通过反射工作。


Answer 4:

Lecturers是一个领域,但数据绑定,只有性质的作品。 尝试宣告Lecturers ,如:

public ObservableCollection<Lecturer> Lecturers { get; set; }


Answer 5:

MainWindow.xaml.cs:OK

MainWindow.xaml:OK

LecturerListViewModel.cs:OK -假设GetAllLecturers()方法返回ObservableCollectionLecturer

Lecturer.cs:

public class Lecturer : INotifyPropertyChanged
{
    //public Lecturer(){} <- not necessary

    private int _id;
    public int Id 
    {
        get { return _id; }
        set
        {
            _id = value;
            OnPropertyChanged("Id");
        }
    }
    // continue doing the above property change to all the properties you want your UI to notice their changes.

    ...

    public event PropertyChangedEventHandler PropertyChanged;
    private void OnPropertyChanged(string propertyName)
    {
        var handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

检查这个答案: 添加到INotifyPropertyChanged的模式?



文章来源: MVVM datagrid binding